ISSN Online: 2377-424X
ISBN Print: 978-1-56700-421-2
International Heat Transfer Conference 15
Heat Transfer Enhancement in a Tube Filled with Porous Medium: Influence of Thermal Conductivities of Porous Medium
Abstrakt
The present study aims to numerically investigate the influence of thermal conductivity of a porous medium (ks)on the Nusselt (Nu) and Performance Evaluation Criteria (PEC) numbers of an enhanced tube for heat exchanger (ETfHE). This is accomplished with a porous medium partially inserted within the core flow of the tube under fully developed laminar flow for heat exchange. In this research we demonstrated two cases: one with air as the working fluid and the other one with water. The packing ratio of the porous medium is 90%, the scope of Re is 25-2000, and the scope of thermal conductivity is 0.1-200W/(m·K). The simulation results show that, under the given working conditions, the Nu and PEC numbers of the ETfHE will neither increase monotonically with the thermal conductivity of the porous medium nor increase monotonically with the Reynolds (Re) number. These results are different from the conventional thinking that increasing the thermal conductivity of a porous medium will increase the overall performance of the ETfHE.